snuyanzin commented on code in PR #29004:
URL: https://github.com/apache/flink/pull/29004#discussion_r3837740231
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flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/functions/SqlFunctionUtils.java:
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@@ -345,29 +331,39 @@ public static String rpad(String base, int len, String
pad) {
return "";
}
- char[] data = new char[len];
- char[] baseChars = base.toCharArray();
- char[] padChars = pad.toCharArray();
+ int baseEnd = endOfCodePoints(base, len);
+ int padChars = padLength(pad, len - base.codePointCount(0, baseEnd));
+ char[] data = new char[baseEnd + padChars];
+
+ base.getChars(0, baseEnd, data, 0);
+ writePad(data, baseEnd, pad, padChars);
- int pos = 0;
+ return new String(data);
+ }
- // copy the base
- while (pos < base.length() && pos < len) {
- data[pos] = baseChars[pos];
- pos += 1;
+ /** Index just past the first count code points of str, or its end if str
holds fewer. */
+ private static int endOfCodePoints(String str, int count) {
+ int index = 0;
+ for (int i = 0; i < count && index < str.length(); i++) {
Review Comment:
extract `str.length()` into a var
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